This calcite was mined by the Griffith family in 2017 from their private commercial specimen mining operation located in Hastie's quarry in the Spar Mountain area near Cave-In-Rock, Illinois. Under long wave UV the calcite shows a beautiful rich orange fluorescent response, and a similar, but dimmer response is seen under short wave UV. This piece really comes to life under mid wave UV, showing bright pink/magenta fluorescence. The size of this specimen is 70.0 x 59.5 x 54.0 mm, and it weighs 232 grams.
There are also clusters of small, cubic, dark purple colored fluorite crystals on this specimen, but they are not fluorescent.